How can one reconcile the Hadith about the debate between Adam and Moses, in which Adam argued with destiny, and the Hadith that states: "Indeed, Allah wrote the destinies of all creatures fifty thousand years before He created the heavens and the earth"?

There is no contradiction between the hadith (definition) "Allah recorded the destinies of all creation fifty thousand years before He created the heavens and the earth" and the hadith about the dispute between Adam and Musa, in which Adam stated that what was decreed for him occurred forty years before his creation. The first is a general decree for all creation, while the second is a specific decree for Adam and his descendants, and it does not contradict the first decree. There are other decrees, such as the decree for each individual and the decree of Laylat al-Qadr (the Night of Decree), all of which do not contradict the initial general decree.